KR101327862B1 - Flow rate correction device for setting infusion flow rate and method for optimum flow rate regulation using discharge coefficientt of iv flow regulator - Google Patents

Abstract

The present invention relates to a correction device for setting the flow rate of an infusion solution, which is able to adjust scale of an infusion solution flow rate controller corresponding to aimed flow rate based on one-time measured flow rate in setting the aimed flow rate by controlling an infusion solution flow rate controller of an infusion solution set; and a method for controlling optimal flow rate using flow coefficient of the flow rate controller and, more specifically, to a correction device for setting the flow rate of an infusion solution, which is able to acquire scale of an infusion solution flow rate controller for aimed flow rate after estimating the installation state of an infusion solution set through one-time measured flow rate based on fluctuation information of flow rate according to a change of the installation state of the infusion solution set and the scale position of the infusion solution flow rate controller by classifying a factor affecting flow rate as the scale position of the infusion solution flow rate controller and the installation state of the infusion solution set; and a method for controlling optimal aimed flow rate using the flow coefficient of the flow rate controller. [Reference numerals] (S10) Input the target amount of flow;(S20) Input an initial gradations;(S30) Obtain the actual amount of flow;(S31) Input a counter;(S32) Calculate the speed of drip;(S33) Select the volume of drip;(S34) Calculate the actual amount of flow;(S40) Obtain a situation variable value;(S50) Obtain a coefficient value;(S60) Set the amount of sap flow

Description

FLOW RATE CORRECTION DEVICE FOR SETTING INFUSION FLOW RATE AND METHOD FOR OPTIMUM FLOW RATE REGULATION USING DISCHARGE COEFFICIENTt OF IV FLOW REGULATOR}

The present invention adjusts the flow rate controller of the infusion set to adjust the target flow rate in order to adjust the flow rate of the calibration device and the flow rate regulator for setting the flow rate flow rate controller corresponding to the target flow rate based on one flow measurement It is related to the optimal target flow rate control method using, and more specifically, factors influencing the flow rate include the scale position of the infusion flow regulator and the installation state of the infusion set (all factors other than the scale position: the height of the sap, the type of the sap). , Flow rate according to the change of flow rate according to the scale position of the fluid flow regulator and the installation state of the fluid set, divided into fluid temperature, weather pressure, different air pressure change, needle thickness, patient blood resistance, etc. Calibration field for infusion flow setting to obtain the scale of the infusion flow controller for the target flow after estimating the installation state of the infusion set. And to a target optimum flow rate control method using the flow coefficient of the flow regulator.

1 is a state diagram of a typical set of infusion set, and FIG.

As shown in FIG. 1, the infusion set 2 is connected to the infusion bottle 1 to administer the infusion in the infusion bottle 1 to the patient through the needle 30 of the infusion set 2 as shown in FIG. 1. As a result, the pressure of the height difference between the infusion bottle 1 and the injection needle 30 is applied to the infusion to be administered to the patient.

In this way, the infusion set (2) for administering the sap connected to the infusion bottle (1) is inserted into the sealing stopper of the infusion bottle (1) to insert the needle (11) for the sap contained in the infusion bottle (1) flows out. Dropping container (10), the patient is provided in the upper portion and the sap flowing out through the insertion needle 11 is dropped in the inner space in the form of a drop (12, drop, unit: GTt) to be discharged after being accumulated in the lower portion of the inner space Injected into the vein of the needle 30, the dropping tube 10 is connected between the needle 30 and the tube 20, which serves as the infusion passage of the fluid is installed in the middle of the tube 20, the flow rate of the fluid It is configured to include a fluid flow rate controller 40 and the roller clamp 40 'to enable the adjustment.

The drop 12 falling from the inside of the drop container 10 is to make the drop container 10 so as to have a constant volume if the sap falls in the form of water droplets. For example, if one drop is made of 20 drops per 1cc of sap, one drop volume is 1 / 20cc, and if the drop is made of 60 drops per 1cc of sap, one drop volume is 1 / 60cc. Therefore, when the period of dropping in the interior space of the drop container 10 is measured, it is possible to calculate the flow rate of the sap injected through the infusion set (2).

The target flow rate prescribed in the actual clinical practice is to measure the flow rate obtained by the number of droplets (drops) falling into the drop container in consideration of all factors other than the infusion flow controller (the type of infusion fluid, the thickness of the needle, and the resistance of the patient's blood vessels). And based on this can be adjusted by adjusting the position of the flow control means.

Here, the flow rate adjusting means installed in the infusion set includes a roller clamp (40 ', Roller Clamp) and the fluid flow rate controller 40 according to the shape of the adjustment portion and the flow control principle, the roller clamp 40' is a roller By changing the cross-sectional area of the flow path of the tube 20 by moving the configured operation portion 41 'up and down, the maximum minimum speed is determined by small distance adjustment, so that the adjustment is not easy, and an incorrect and accurate display scale cannot be displayed.

Recently, the fluid flow regulator (40, IV Flow Regulator) for adjusting the flow rate by changing the flow path formed therein as shown in Fig. 1 or 2 to the fluid injection requiring precision to compensate for the disadvantage of the roller clamp (40 ') ) Has been developed and used. The IV flow regulator 40 may change the flow rate as the rotation angle is changed by rotating the operation unit 41, and the display scale 42 is engraved within the rotation angle adjustment range of the operation unit 41. Then, the flow rate was adjusted by adjusting the operation unit 41 to the display scale 42 corresponding to the target flow rate.

In general, as shown in Fig. 1, a roller clamp 40 'is also used in an infusion set using an IV flow regulator.

However, when the flow rate of the fluid administered by the infusion set (2) at the clinical site is actually measured, the difference from the display scale (42) is large. The reason for such a difference is that the display scale 42 of the fluid flow controller 40 affects the actual fluid speed in the laboratory (the height of the fluid, the type of fluid, the thickness of the needle, and the resistance of the patient's blood vessels). This is because the experiment was indicated by one sap at a certain height without considering the etc.). Actual clinical settings are different from these laboratory conditions, and most of all, the patient's vascular resistance (different vascular resistance in children, young people, the elderly, etc.) is not taken into account. This is very important for the treatment of chlorine and can lead to a very high risk if the difference between the prescribed flow rate and the actual input flow rate is large.

Therefore, in the registered patent No. 10-1058539, the applicant sets the reference point when carving the display scale 42 of the infusion flow rate controller 40, and then displays the relative ratio between the flow rate at the display scale and the flow rate at the reference point as the display scale. As a result, the flow rate was measured at the reference point, and the sap could be administered at the target flow rate simply by matching the indicated scale with the target flow rate. According to this, since it adjusted to target flow volume by one measured flow volume, the display scale suitable for a target flow volume was able to be found quickly.

However, since the current flow rate regulator is used to control the flow rate by changing the depth of the circular flow path, the flow pattern according to the variation of the display scale is not linear.

In Patent No. 10-1058539, in order to display the scale of the sap flow controller in a relative ratio, the sap flow controller must be linearized, which requires high cost for commercialization and restrictions on commercial use.

And in order to find the indication scale that meets the target flow rate, the reference point of the infusion flow controller must be fixed at the same position at the time of measuring the flow rate. Even during speed calibration, the display position of the flow controller has to be moved back to the reference point.

In addition, since the speed display method is displayed as a ratio, it is difficult to change habits and use intuitively because it is different from the actual display unit scale.

KR 10-1058539 A 2011.08.16.

Accordingly, an object of the present invention is to quickly and accurately find and adjust the adjustment position of the infusion flow rate controller for the target flow rate by reflecting the change even if the installation state of the infusion set is changed, and sap to increase the accuracy of the flow rate by reflecting the volume change of the drop It is to provide an optimum target flow rate control method using the flow rate correction device for the flow rate setting device and the flow regulator.

In order to achieve the above object, the present invention, the display scale is engraved within the operating range of the operation unit 41, the fluid flow regulator 40 to adjust the flow rate of the fluid by changing the display scale instructed by the operation unit 41 In the infusion set (2) comprising a correction device for fluid flow setting to obtain a display scale to be instructed by the operation unit 41 to administer the fluid at the target flow rate determined according to the prescription of the fluid treatment, the target flow rate, An input unit 110 for obtaining an arbitrary initial scale indicated by the operation unit and an actual flow rate measured by the operation unit 41 indicating the initial scale; Preset relational expression between measurable situation variable (X) varying according to the installation state of the infusion set, coefficient (C) varying according to the display scale indicated by the control unit 41, and flow rate (Q) of the fluid administered in the infusion set A memory unit 130 for storing the value of the coefficient C for each display scale obtained by substituting the measured values of the situation variable X and the flow rate Q into the display unit; Value X ₁ of the coefficient (C) a value C ₁ and the measured after the flow rate assigned to the relational expression obtaining a value X ₁ of the status variable (X), the acquisition status variables (X) of which corresponds to the initial scale, and A setting value calculation unit 150 for substituting the target flow rate into the relational expression to obtain a value C ₂ of a coefficient C; An output unit 120 for outputting a display scale corresponding to the value C ₂ of the coefficient C obtained by the setting value calculation unit 150; And a control unit.

The relational expression is characterized in that the relation Q = CX indicating that the flow rate (Q) is proportional to the situation variable (X) and the coefficient (C), respectively.

The situation variable (X) is characterized in that the hydraulic pressure difference between the infusion bottle (1) and the injection needle (30) determined according to the installation state of the infusion set.

The situation variable (X) is characterized in that the height difference between the infusion bottle (1) and the injection needle (30) determined according to the installation state of the infusion set.

The input unit 110 may be configured to omit the input of the initial scale by making the initial scale equal to the target flow rate.

The input unit 110 is configured to receive a counter input drop falling from the drop container of the infusion set, the flow rate calculation unit for obtaining the actual flow rate by multiplying the preset drop volume per unit time according to the time difference of the counter input ( 140), wherein the preset drop volume is set for each drop size per unit time, and the flow rate calculation unit 140 multiplies the drop volume corresponding to the drop size per unit time by the drop number per unit time. Characterized in that to obtain the measured flow rate.

A passage for inserting the drop container of the infusion set; A light emitting element provided at one side of the passage; And a light receiving element installed at the other side of the passage and allowing light emitted from the light emitting element to pass through the dropping tube inserted into the passage; And a flow rate calculation unit 140 for counting the drop by the disturbance of the light detected by the light receiving element and multiplying the drop volume per unit time according to the countered time difference to obtain the actual flow rate. The preset drop volume is set for each drop size per unit time, and the flow rate calculation unit 140 obtains the measured flow rate by multiplying the drop volume corresponding to the size of the drop number per unit time by the drop number per unit time. It features.

A camera for photographing the drop container; And an image processing processor for counting the droplets by extracting the droplets from the image photographed by the camera. And a flow rate calculation unit 140 for counting the drop and multiplying the drop volume per unit time according to the counter time difference to obtain a measured flow rate, wherein the preset drop volume is per unit time. Set by the size of the drop number, the flow rate calculation unit 140 is characterized by obtaining the actual flow rate by multiplying the drop volume corresponding to the size of the drop number per unit time by the number of drops per unit time.

The present invention includes an infusion set (2) including an infusion flow rate controller (40) in which a display scale is engraved within an operating range of an operation unit (41) to adjust the flow rate of an infusion by changing a display scale instructed by the operation unit (41). In the above, the measurable situation variable (X) which varies according to the installation state of the infusion set (2), the coefficient (C) which varies according to the indication scale supported by the operation unit 41, and the flow rate of the infusion to the infusion set (Q) Sap by using a correction device for setting the fluid flow rate, in which the value of the coefficient (C) is stored for each display scale obtained by substituting the measured values of the situation variable (X) and the flow rate (Q) into a preset relation between An optimal target flow rate control method using a flow rate coefficient of the flow controller for controlling the flow rate of the flow rate, the target flow rate input step of receiving a target flow rate determined according to the prescription of the fluid treatment; An initial scale input step of receiving an arbitrary initial scale indicated by the operation unit 41; A measured flow rate obtaining step of obtaining a measured flow rate measured by the operation unit 41 indicating an initial scale; Obtaining a situation variable value X ₁ of the situation variable X by substituting the value C ₁ of the coefficient C corresponding to the initial scale and the measured flow rate into the relational expression; A coefficient value obtaining step of obtaining a value C ₂ of a coefficient C by substituting the value X ₁ of the situation variable X obtained in the situation variable value obtaining step and the target flow rate into the relational expression; And a sap flow rate setting step of outputting a display scale corresponding to the value C ₂ of the coefficient C obtained in the coefficient value obtaining step, so that the operation unit 41 instructs the output display scale. do.

The initial scale is made equal to the target flow rate, and the initial scale input step is omitted.

The measured flow rate obtaining step may include: a counter input step of receiving a counter input of a drop falling from a drop container of an infusion set; A drop speed calculating step of calculating a drop number per unit time according to a time difference of a counter input; A measured flow rate calculating step of calculating a measured flow rate by multiplying a predetermined drop volume by a unit time per unit time; wherein the measured flow rate calculating step is set by the size of the drop volume per unit time, The measured flow rate may be calculated by multiplying the drop volume corresponding to the drop number per unit time obtained in the drop speed calculating step by the drop number per unit time.

According to the present invention made as described above, the relationship between the factors related to the installation state of the infusion set and the adjustment indicator scale of the infusion flow regulator that affects the flow rate of the infusion administered in the infusion set and the adjustment of the infusion flow regulator By acquiring the factors by the display scale in advance, the accurate target scale according to the installation state can be found even with one actual flow rate measured at any display scale, so that the flow rate control and the accurate flow rate control are possible.

In addition, the present invention is configured as a portable device to store the factors due to the adjustment scale of the infusion flow rate regulator, it is possible to adjust the flow rate of various types of infusion flow rate in one portable device.

1 is a state diagram of the installation of a typical infusion set.
Figure 2 is a view showing another form of the fluid flow rate regulator for adjusting the fluid flow rate in a commercially available infusion set.
Figure 3 is a state of use of the correction device for the fluid flow setting according to an embodiment of the present invention.
Figure 4 is a block diagram of a correction device for infusion flow setting according to an embodiment of the present invention.
5 is a flow chart of the method for adjusting the optimum target flow rate using the flow coefficient of the flow controller according to an embodiment of the present invention.
6 is a Moody Chart.
7 is a graph showing the change of the flow rate for the display scale of the infusion flow regulator and the value of the overall flow coefficient for the display scale.
8 is a graph showing the value of the laminar flow total flow coefficient for the change in flow rate and the display scale of the infusion flow rate regulator.
9 is a graph showing the variation of the drop volume with respect to the dropping speed.
10 is a graph of the flow rate for the display scale shown to show an actual application of the optimum target flow rate adjustment method using the flow coefficient of the flow controller according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are used to denote the same or similar components in other drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

<Calibration device for fluid flow setting>

3 is a state diagram of a correction device for setting the fluid flow rate setting according to an embodiment of the present invention, Figure 4 is a block diagram of a correction device for a fluid flow setting according to an embodiment of the present invention.

Referring to FIGS. 3 and 4, the correction device for setting the infusion flow rate according to an embodiment of the present invention 100 connects the infusion bottle 2 to the infusion bottle 1 to inject the infusion of the infusion solution. The device is adapted to the target flow rate determined according to the prescription of the treatment.

Here, the infusion set (2) is a known configuration that includes a dropping tube 10, tube 20, needle 30 and the infusion flow rate controller 40 as described with reference to Figures 1 and 2 , Briefly.

The drop container 10 inserts the insertion needle 11 into the closed stopper of the infusion bottle 1 so that the sap contained in the infusion bottle 1 flows out through the insertion needle 11, and the insertion needle 11 After the sap flowing through the drop into the drop 12 in the inner space to maintain a constant level in the lower portion of the inner space to flow to the tube (20).

The injection needle 30 is inserted into the vein of the patient. The tube 20 is connected between the drop container 10 and the needle 30 to administer the fluid through the needle 30.

Sap flow rate controller 40 is installed on the tube 20 is configured to be able to adjust the flow rate of the fluid flowing through the tube 20 to move the operation unit (41). Although the fluid flow rate controller 40 has various types, according to the embodiment of the present invention, the display scale is engraved within the operating range of the operation unit 41 so that the flow rate of the fluid is changed by changing the display scale indicated by the operation unit 41. Targeted to the fluid flow controller 40 to be adjusted.

In the administration of the sap to the patient by connecting the infusion set 2 to the infusion bottle 1 as described above, the present invention instructs the operation unit 41 in the infusion flow controller 40 to administer the infusion at the target flow rate. The display scale to be obtained is obtained and outputted. For this purpose, the input unit 110 includes an input unit 110, an output unit 120, a memory unit 130, a flow rate calculation unit 140, and a setting value calculation unit 150.

The input unit 110 is a target flow rate determined according to the prescription of the fluid treatment, any initial scale indicated by the operation unit 41 in the infusion flow rate controller 40, and the operation unit 41 in the infusion flow rate controller 40 is the initial scale It is provided to obtain the measured flow rate which is the flow rate that can be obtained by measuring in the state indicated by. At this time, the target flow rate and the initial scale are input as a value. The measured flow rate is obtained by measuring the drop period of the drop by measuring the drop period of the drop in a manner generally used in another flow measuring device or a hospital, and calculating the drop volume and inputting it through the input unit 110, According to the embodiment of the present invention, since the input unit 110 includes a coefficient input key 111 for counting the drop, and the flow rate calculation unit 140 described below, the flow rate is calculated when the counter is input when the drop falls. .

The output unit 120 outputs the position of the target scale obtained by the following setting value calculation unit 150. The target scale indicates the position of the display scale to be instructed by the operation unit 41 in the infusion flow controller 40 in order to administer the fluid at the target flow rate. The flow rate to be administered is adjusted to the target flow rate.

The memory unit 130 stores characteristic information of the infusion flow rate controller 40 and characteristic information of the drop container 10.

First, the characteristic information of the infusion flow rate controller 40 is a measurable situation variable X, which varies according to the installation state of the infusion set, coefficient C varying as the position of the display scale indicated by the control unit 41 in the infusion flow rate controller changes, And a preset relationship Q = f (C, X) indicating a relationship between the flow rate Q of the sap administered in the sap set. That is, the flow rate Q is expressed as a function that changes depending on the values of the situation variables X and the coefficient C. Here, the situation variable X and the coefficient C have orthogonality, and the coefficient C is selected so as not to change even when the situation variable X changes. Orthogonality can be seen from the induction process of the relationship Q = f (C, X) in the following for the commonly used fluid flow regulator.

Then, by measuring the situation variable X and the flow rate Q at each display scale and substituting the relational expression Q = f (C, X), the coefficient C for the display scale is obtained and stored together in the memory unit 130. Specifically, after measuring the flow rate Q while changing the installation state (ie, the situation variable X) of the infusion set at each display scale 42, the measured values of the situation variable X and the flow rate Q are expressed by the above-mentioned relation Q = f. By substituting (C, X) to obtain the coefficient C, the coefficient C for each display scale 42 is obtained. If the value of the coefficient C obtained for each situation variable X at each display scale 42 is difficult to match exactly by experimental error, the value of the coefficient C obtained by changing the installation state at each display scale is averaged for the display scale. Determine the value of the coefficient C.

On the other hand, the value of the coefficient C for each display scale 42 is estimated by using a close value or a function of the curve obtained by performing curve fitting on the value of the coefficient C, that is, the display scale. Storing and using a function of the coefficient C in the memory unit 130 is a modification of the method of storing and utilizing data, but it is obvious that the function of the coefficient C is within the scope of the present invention.

In an embodiment of the present invention, the situation variable (X) is a level difference that varies according to the installation state of the infusion set, that is, a height difference between the infusion bottle 1 and the injection needle 30 or a water pressure difference, that is, an infusion bottle. The pressure difference between (1) and the needle 30 was determined. Here, the height difference may be viewed as a water level difference. Although the level of the infusion bottle is lowered as the fluid is administered, the level difference gradually decreases. However, the error caused by lowering the water level in the application of the present invention may be regarded as an error range allowed by the fluid treatment. Therefore, in the present invention, the height difference and the water level difference are used in the same meaning.

Further, in the embodiment of the present invention, the relationship Q = f (C, X) is differently selected depending on whether the flow of the sap administered through the infusion set 1 is turbulent or laminar, and if the laminar flow, the coefficient C is laminar. It becomes a global flow coefficient, and if it is turbulent, the said coefficient C becomes a global flow coefficient. In the case of the infusion set 1 currently used commercially, since it is judged to be laminar flow as mentioned later, the relational formula Q = CX is employ | adopted for the infusion set 1 currently used as mentioned later.

In addition, the flow rate Q in the relation Q = f (C, X) may be a flow rate obtained from the drop speed described below, but in this case, a drop volume changed according to the drop speed is applied as described below. Let flow rate.

Next, the characteristic information of the drop container 10 is information of the drop volume set for each size of the drop speed (the number of drops per unit time: the number of drops falling per unit time).

In general, assuming that the volume of the drop 12 falling from the inner space of the drop cylinder 10 is set to a predetermined value in advance, the flow rate was calculated by counting the drop 12, but as a result of the applicant's actual measurement Since the volume of the drop 12 appears to be different, it is possible to obtain the correct flow rate by applying the volume of the drop 12 corresponding to the drop rate. That is, the fluid flow rate in the infusion set 1 can be seen from the drop 12 falling from the drop container 10. Since the volume of the drop 12 varies according to the drop speed, the flow rate calculation unit ( In step 140), the flow volume is calculated by applying the drop volume corresponding to the drop speed.

The flow rate calculation unit 140 calculates a time difference between the counter input (that is, the pressing of the coefficient input key 111) when the counter input of the coefficient input key 111 provided in the input unit 110 occurs, and the drop speed is calculated. After calculating (drops per unit time), flow rate is obtained by multiplying drop speed by drop volume. Here, the obtained flow rate is an actual flow rate.

Since the drop volume varies depending on the drop speed, the drop volume corresponding to the measured flow rate is applied based on the characteristic information of the drop container 10 as described above.

The setting value calculation unit 150 calculates a target scale based on the target flow rate and initial scale input to the input unit 110 and the measured flow rate obtained by the flow rate calculation unit 140, and then the output unit 120 is calculated. Output through Here, the target scale is the display scale at the position where the operation portion 41 of the infusion flow controller 40 is operated and instructed so that the flow rate of the infusion is the target flow rate.

Specifically, the value C ₁ of the coefficient C corresponding to the input initial scale and the obtained measured flow rate are substituted into the relational expression Q = f (C, X) to obtain the value X ₁ of the situation variable X, Context variable X value X ₁ And the value C ₂ of the coefficient C by substituting the target flow rate into the relational expression Q = f (C, X). Then, the position of the display scale corresponding to the value C ₂ of the coefficient C obtained here is output to the output unit 120 using the target scale. That is, after the situation variable, i.e., the installation state of the infusion set is found from the measured flow rate and the initial scale, the target scale for obtaining the target flow rate in the installation state of the infusion set is found and output.

On the other hand, the display scale 42 of the infusion flow rate controller 40 is generally expressed as a flow rate, if the value of the above-mentioned coefficient C in place of the flow rate, correction for the infusion flow setting according to an embodiment of the present invention The device 100 stores the position of each display scale as the value of the coefficient C.

On the other hand, in using the correction apparatus 100 for setting the fluid flow rate according to the embodiment of the present invention, in the case of the display scale 42 in which the flow rate is indicated, the initial scale at the time of measuring the flow rate is matched with the target flow rate. If it is used to obtain the measured flow rate, the initial scale when measuring the flow rate may not be received. That is, at this time, the value of the initial scale to be input coincides with the target flow rate.

<Optimum Target Flow Control Method using Flow Factor of Flow Controller>

5 is a flow chart of a method for adjusting the infusion flow rate using the correction device 100 for setting the infusion flow rate described above.

Referring to FIG. 5, the optimum target flow rate adjusting method using the flow coefficient of the flow controller according to the embodiment of the present invention includes a target flow rate input step S10, an initial scale input step S20, and an actual flow rate acquisition step S30. , The situation variable value obtaining step (S40), the count value obtaining step (S50), and the fluid flow rate setting step (S60).

Target flow rate input step (S10) receives the target flow rate determined according to the prescription of the fluid treatment.

The initial scale input step S20 receives an arbitrary initial scale indicated by the operation unit 41. Here, the initial scale input is a display scale indicated by the operation part 41 in the infusion flow rate controller 40, when the following measured flow volume is obtained. In the case of using the infusion flow rate controller in which the flow rate is displayed on the display scale, if the operating unit 41 instructs the display scale at the position where the flow rate coinciding with the target flow rate is obtained, the measured flow rate is obtained. According to the sap flow rate adjustment method does not include the initial scale input step (S20), after executing the target flow rate input step (S10), and performs the following measured flow rate acquisition step (S30), where the initial scale is the target flow rate Treated as

In the measured flow rate obtaining step (S30), the measured flow rate is obtained by measuring the flow rate in the state in which the initial scale is indicated through the operation unit 41 of the infusion flow rate regulator. In the embodiment of the present invention, since the drop 12 is inputted by the counter input key 111, the measured flow rate obtaining step S30 counters the input of the counter input key 111 that is pressed every time the drop 12 is dropped. A counter input step (S31) for receiving a predetermined number of counter inputs as an input, a drop speed calculating step (S32) for calculating a drop speed (the number of drops of a drop per unit time) from a time difference between the counter inputs, and a corresponding drop speed And selecting a preset drop volume (S33), and then calculating the measured flow rate by multiplying the selected drop volume by the drop speed (S34). Here, since the preset drop volume has a different value according to the drop speed as described above, the drop volume is set for each drop speed and selects a value corresponding to the drop speed obtained in the drop speed calculation step S32. On the other hand, the measured flow rate obtaining step (S30) may be employed to measure the flow rate of the patented patent application No. 10-0706954 "sap injection rate measuring device" created and filed by the inventors of the present invention, even at this time Select the drop volume.

On the other hand, the counter input step (S31) in the embodiment of the present invention, but the counter input the drop 12 with the counter input key 111, it does not have a counter input key 111, but instead counter the drop 12 Other components may be provided for use.

For example, as a component for countering the drop 12, a 'u' shaped passageway into which the drop container 10 can be inserted, a light emitting element provided on one side of the passage, and a light emitting element installed on the other side of the passage, The correction apparatus 100 for setting the fluid flow rate may be configured to include a light receiving element that senses light emitted. Accordingly, after the drop container 10 is inserted into the passage, the drop 12 is countered by the change of light detected by the light receiving device while the light emitting device emits light. In other words, the light emitted from the light emitting device passes through the dropping tube 10 and is detected by the light receiving device. When the drop 12 falls, the light is disturbed (the light that received light is scattered or reflected by the drop. In this case, the drop 12 is sensed by counteracting whether the light is disturbed or not, so that the drop 12 is countered.

As another example, as a component for countering the drop 12, the correction apparatus 100 for setting the fluid flow rate can be configured to include a camera and an image processing processor. That is, the drop barrel 10 is photographed with a camera to obtain an image of the drop barrel 10, and then the image is extracted by the image processing processor to extract the image of the drop 12. Accordingly, the drop 12 is counted by detecting the appearance and drop of the drop 12 image.

On the other hand, since the counter input step S31 and the drop speed calculation step S32 are steps for obtaining the drop speed, if another device for obtaining the drop speed is used, the counter input step S31 and the drop speed are used. If the component for the calculation step (S32) is not provided in the correction device 100 for setting the fluid flow rate, the drop speed should be input to the input unit 110.

The situation variable value obtaining step (S40) is a value of the value C ₁ of the coefficient C corresponding to the initial scale input in the initial scale input step (S20), and the measured flow rate obtained in the measured flow rate obtaining step (S30). Substitute f (C, X) to obtain the value X ₁ of the situation variable X. Here, the value X ₁ of the acquired situation variable X is a value representing the installation state of the infusion set 2, and according to the embodiment of the present invention, it occurs according to the height difference between the infusion bottle 1 and the injection needle 30. It is water level difference or water pressure difference.

Counting value obtaining step (S50) is the relationship between the value X ₁ of the situation variable X obtained in the situation variable value obtaining step (S40) and the target flow rate input in the target flow rate input step (S10) of the relationship equation Q = f (C, The value C ₂ of the coefficient C is obtained by adding to X).

Sap flow setting step (S60) is outputted to the output unit 120 using the display scale of the position corresponding to the value C ₂ of the coefficient C obtained in the coefficient value obtaining step (S50) as a target scale, the fluid flow regulator ( 40 is adjusted to the target scale.

If the flow rate is not engraved on the display scale 42 of the infusion flow rate controller 40, the value of the coefficient C at each display scale is engraved, and the value C ₂ of the coefficient C obtained in the count value acquisition step S50 is output. do.

<Specific Example of Relation Q = f (C, X)>

Hereinafter, specific examples of the above-described relationship Q = f (C, X) will be described.

First, we define the main variables used in the formula.

P: pressure, H: water level, Q: flow rate,

: 수액밀도,

: 점성계수,

: 동점정계수

: Sap density,

= Viscosity coefficient,

: Tie-coefficient

g: acceleration of gravity, L: length of flow path, D: diameter of cross section of flow path,

: 이론적 유속A is the cross-sectional area of the flow path, V is the flow velocity,

Theoretical flow rate

: 유량계수, f : 마찰계수, Re: Reynolds number,

: Coefficient of flow, f: coefficient of friction,

: 총괄유량계수,

: 층류총괄유량계수

: Overall flow coefficient,

: Laminar flow total flow coefficient

As shown in FIG. 3, the relationship between the water level difference and the pressure difference according to the height difference between the infusion bottle 1 and the injection needle 30 is represented by Equation 1 below, and the pressure difference may be represented by the water level difference. .

As shown in Equation 1, the pressure difference due to the water level difference acts as a differential pressure on the front and rear ends of the flow regulator, and becomes a driving force for causing the flow. In general, the flow controller changes the flow rate by adjusting the flow resistance with respect to the differential pressure of the front and rear ends.

By the way, since the flow rate when administering the sap is a very small value compared to the use range of the general flow regulator, precise flow rate control is difficult with the general flow regulator. That is, a very small flow rate requires a very large flow resistance to obtain a high flow rate resolution as the flow rate is very small.

The flow inside the flow path of the precision sap flow regulator is a kind of intra-pipe flow. Relational expression that represents the differential pressure caused by flow resistance in the flow tube is the same as equation (2) below (FM White, "Fluid Mechanics" , 2 nd Ed., McGraw-Hill, 1986, ISBN 0-07-069673-X, p .303, Eq. 6.30).

Here, the pressure loss is expressed as a water level difference, and f may be obtained from a Moody Chart shown in FIG. 6 as a friction factor.

Looking at Equation 2, the smaller the cross-sectional diameter of the flow path or the longer the length of the flow path can give a large flow resistance. Using this relationship, the infusion flow regulator forms a narrow and long flow passage to inject the sap into one end of the flow passage and vary the discharge point of the sap along the flow passage. Since the discharge point of the sap is varied by changing the rotation angle of the operation unit 41, changing the rotation angle of the operation unit 41 can change the length of the flow path to change the flow resistance. As a result, even if the front and rear differential pressure of the fluid flow regulator is the same, the flow resistance is changed to change the flow rate.

는 아래의 수학식 3과 같이 표현된다.Since the hydrodynamic variable representing the flow rate with respect to the front and rear pressures of the flow regulator is the flow coefficient, the flow coefficient of the flow regulator is changed when the length of the flow path is changed. Discharge coefficient

Is expressed by Equation 3 below.

은 전후단 차압에 대해 아래의 수학식 4와 같은 관계를 가지며, 이로부터 상기 수학식 3은 아래의 수학식 5와 같이 표현된다.Where the theoretical flow rate

Has a relationship as shown in Equation 4 below with respect to the front and rear pressure differential, from which Equation 3 is expressed as Equation 5 below.

By substituting Equation 1 into Equation 5, the following Equation 6 for the actual flow rate V can be obtained, and accordingly, the flow rate is proportional to the square root of the water level difference.

를 아래의 수학식 7처럼 정의한 후 유량 Q에 대한 아래의 수학식 8을 얻는다.And, by multiplying the flow rate V by the flow rate V in Equation 6, an equation for the flow rate Q can be obtained.

Is defined as in Equation 7 below, and Equation 8 for flow rate Q is obtained.

는 아래의 수학식 10으로 표현된다.On the other hand, when the equation (6) is summarized in the following equation (9) for the water level difference and compared with the equation (2), the flow coefficient

Is expressed by Equation 10 below.

Looking at the equations (7) and (8), the flow rate Q is proportional to the square root of the level difference that varies depending on the installation state of the infusion set (2) and proportional to the overall flow coefficient. In addition, according to equation (1), the flow rate Q is proportional to the square root of the pressure difference.

Here, the water level difference (or pressure difference) varies depending on the installation state of the infusion set 2.

는 수학식 7 및 수학식 10에서 확인할 수 있듯이, 유도의 단면적 A와 유로 길이 L에 의해서 결정되는 변수이므로, 수액유량조절기(40)의 조작부(41)를 조작함에 따라 변동한다. 즉, 수액유량조절기(40)에서 조작부(41)를 어느 표시눈금(42)에 맞추냐에 따라 상기 총괄유량계수

가 결정되어 유량을 변경시킬 수 있다.Overall flow coefficient

As can be seen in equations (7) and (10), since it is a variable determined by the cross-sectional area A and the flow path length L of the induction, it changes as the manipulator 41 of the infusion flow controller 40 is operated. That is, the total flow coefficient according to which display scale 42 the operating unit 41 in the infusion flow rate controller 40

Can be determined to change the flow rate.

는 수위차와 유량 간의 관계를 표준화(Normalize)하는 변수가 되므로, 수액유량조절기(4)의 각각의 표시눈금(42)에서 서로 다른 수위차에 대한 유량을 측정하면 각각의 표시눈금(42)에 대한 총괄유량계수

의 값을 구할 수 있다. 그리고, 각각의 표시눈금에서의 총괄유량계수의 값을 알게 됨에 따라, 수위차가 주어지면 해당 눈금에서의 유량을 산출할 수 있을 뿐만 아니라, 해당 눈금에서의 유량을 측정하면 수위차를 산출할 수도 있다.As you can see from Equation 8, the total flow coefficient

Since is a variable that normalizes the relationship between the level difference and the flow rate (Normalize), when the flow rate for the different level difference is measured at each display scale 42 of the fluid flow regulator 4, each display scale 42 Overall flow coefficient

Can be obtained. Then, as the value of the overall flow coefficient at each display scale is known, the flow rate at the scale can be calculated not only when the level difference is given, but also the level difference can be calculated by measuring the flow rate at the scale. .

Accordingly, Equation 8 may be used as the relation Q = f (C, X) used in the present invention.

7 is a graph of the flow rate for the display scale and the total flow coefficient for the display scale according to the results of measuring the flow rate by changing the display scale for each level difference for the actual fluid flow rate controller. Here, the solid line is the flow rate measured at different water level differences, and the dotted line is the overall flow rate coefficient calculated using the water level difference and the flow rate. The water level difference was changed to 72cm, 101cm, 150cm, and 199cm, and the flow rates for each of the display scales were measured.

However, referring to FIG. 7, it can be seen that the values of the collective flow coefficients do not converge for the same display scale. This means that, contrary to the prediction from the theoretical analysis, the flow rate for the level difference is not standardized by the overall flow rate coefficient. Thus, for a commercially available fluid flow regulator, Equation 8 is expressed as the relationship Q = f (C, X). It means that it can't be used.

However, it should be noted that Equation 8 is a general expression for turbulent flow in the tube, and laminar flow is expressed differently.

6 is a graph of the friction coefficient f with respect to Reynolds Number Re (Reynolds Number) represented by Equation 11 below, but it can be seen that it is divided into three regions according to the size of Reynolds Number Re. That is, a region having a Reynolds number Re of about 2300 or less is a laminar flow zone, and when the Reynolds number Re exceeds 2300, it is divided into a transitional or critical zone and a turbulent flow zone.

According to Equation 11, the Reynolds number is proportional to the flow rate V, but when looking at the moody chart of FIG. 6, the friction coefficient f in the turbulent flow zone is almost horizontal regardless of the Reynolds number, so the constant value is independent of the flow rate. do.

In other words, there is no problem in using Equation 8 as the relational expression Q = f (C, X) of the present invention if the sap to adjust the flow rate with the sap flow controller 40 is turbulent.

However, in view of the fact that the fluid flow rate controller 40 is very narrow in width and the sap has a certain viscosity, the flow inside the flow path is likely to be laminar flow, and the fluid flow rate controller 40 is applied by the applicant. As a result of obtaining Reynolds number Re for), it was found that the value was much smaller than about 2300 for judging whether laminar flow in the tube flow was about 60. That is, the flow of the sap in the sap flow controller 40 of the commercially available sap set is determined to be a fully laminar flow (Fully Laminar Flow).

However, the friction coefficient f in the laminar flow region is expressed by Equation 12 below as indicated in the mood chart of FIG. 6.

That is, in the laminar flow region, the friction coefficient f is not a constant but is inversely proportional to the Reynolds number Re (Reynolds Number), and since the Reynolds number Re is proportional to the flow velocity, the friction coefficient f is inversely proportional to the flow velocity.

Thus, the equation (12) for the laminar flow and the equation (10) for the flow coefficient are substituted into the equation (6) for the flow rate and summarized by the following equations (13) and (14).

를 아래의 수학식 15로 정의한 후 유량에 대한 아래의 수학식 16을 얻을 수 있다.Therefore, the laminar flow total flow coefficient that aggregates the variables shown in Equation (14).

After defining Equation 15 below, it is possible to obtain Equation 16 below for the flow rate.

As a result, since the flow rate of the laminar fluid flow regulator is a perfect laminar flow, as shown in Equation 16, Equation 8 for the flow-level difference in turbulence having a form proportional to the square root of the water level difference There is a difference.

Applicants normalized the results of the above flow measurement experiments on the actual fluid flow rate regulators to the laminar flow total flow coefficients newly defined in Equations 15 and 16 above. 8 is a graph showing the results of the above flow measurement experiment and the newly defined laminar flow total flow coefficient. The solid line represents the flow rate measured at the indicated scales at different level differences, and the dotted line represents the laminar flow total flow coefficient obtained from the level difference and the flow rate.

)의 값이 수위차가 다르더라도 거의 일치함을 확인할 수 있으므로, 상기 수학식 16을 본 발명의 관계식 Q=f(C,X)로 사용하여서, 상용되는 수액유량조절기(40)에 적용할 수 있음을 알 수 있다. Referring to FIG. 8, the laminar flow total flow coefficient obtained at each display scale (

It can be confirmed that the value of) is almost identical even if the water level difference is different, so that Equation 16 can be applied to the commonly used infusion flow controller 40 by using the equation Q = f (C, X) of the present invention. It can be seen.

As described above, the relationship Q = f (C, X) of the present invention may be selected according to whether the fluid to be adjusted by the fluid flow controller 40 is laminar flow or turbulent flow.

On the other hand, the flow rate measured to obtain the Fig. 7 and 8 is obtained by measuring the flow rate of the actual sap flowing out to the needle, not the value measured by counting the drop falling from the drop container (10).

However, in actual medical sites, an error may occur because the flow rate is measured by counting drops. As a result, it was found that the volume of the sap droplets is not constant and fluctuates depending on the drop velocity. Applicants measured the drop volume according to the drop velocity in order to obtain an association between the drop velocity and the drop volume.

FIG. 9 is a graph of the drop volume and the number of drops per ml versus the drop rate to show that the drop volume also varies with the drop speed. Referring to FIG. 9, as the drop rate increases, the drop volume (ml per drop) increases.

Therefore, when the flow rate is obtained by multiplying the drop rate by the drop volume in the actual flow rate acquisition step (S30) of the optimum target flow rate adjustment method using the flow rate coefficient of the flow controller according to an embodiment of the present invention, illustrated in FIG. According to the relationship between a drop speed and a drop volume, a drop volume corresponding to the drop speed should be selected and multiplied by the drop speed.

10 is a graph of the flow rate change with respect to the display scale shown to show a practical application of the optimum target flow rate adjustment method using the flow rate coefficient of the flow controller according to an embodiment of the present invention.

10 shows a process of finding the target scale of the fluid flow controller 40 for administering the fluid at the target flow rate when the target flow rate is determined to be 80 ml / h according to the prescription of the fluid treatment. In order to prevent confusion, variables in a single measurement are indicated by a subscript 'try', and a set target value obtained from the variables in a single measurement is indicated by a 'set'. Compared with the value of the coefficient (C) using the subscript in the above-described embodiment of the present invention, C ₁ is the same as C _{try below,} and C ₂ is the same as C _set below.

10 shows a graph of flow rates obtained as experimental values at 72 cm, 101 cm, and 150 cm 199 cm, respectively, and also illustrates a process obtained by approximating the graph obtained as experimental values, but finds a target scale in a correction apparatus for actual fluid flow setting. In this case, it is not necessary to use the graph of the flow rate against the displayed scale obtained as an experimental value.

로 이루어지는 관계식에 근거하여 사전에 실험적으로 획득한 계수(C, 여기서는 층류총괄유량계수

)의 값이 표시눈금별로 저장된다.In the correction device for setting the fluid flow rate, the equation (16)

Coefficients obtained experimentally (C, here, laminar flow total flow coefficient)

) Is stored for each display scale.

First, after adjusting the operation part 41 to the initial scale 210 which points out the target flow volume 80ml / h in the fluid flow rate regulator 41, it measured the flow volume and obtained the measured flow volume _Qtry , and it was 150 ml / h. Here, the initial scale 210 may not be a display scale in which the target flow rate is engraved, but for convenience of use, the value of the flow rate inscribed in the display scale of the infusion flow rate controller 40 is compared with the flow rate actually generated. Although there is an error, it is still designed to be close to the measured flow rate, so the initial scale 210 is used as the display scale engraved with the target flow rate. In this process, the target flow rate and the initial scale are input to the correction device for setting the fluid flow rate by the target flow rate input step (S10) and the initial scale input step (S20), and the measured flow rate is measured by the measured flow rate acquisition step (S30). Obtained.

(반올림 함)를 얻게 된다. 즉, 수액세트의 설치상태에 따른 상황변수(여기서는 수위차

)를 얻게 된다. 이 과정은 상황변수값 획득단계(S40)에서 이루어진다.Next, according to the value of the coefficient for each display division C obtained by the experiment and stored in the correction apparatus 100 for setting the fluid flow rate, since the value of the coefficient C _try corresponding to the initial scale 210 is 0.977, the coefficient C The value 0.977 of _try and 150 ml / h of the measured flow rate Q _try were substituted into Equation 16 above.

(Rounded up). That is, the situation variable according to the installation state of the infusion set (in this case, the water level difference

) This process is performed in the situation variable value acquisition step (S40).

이므로 이 곡선(200)을 이용하여 근사화할 수 있다(도 10에 도시한 ① 의 과정). Referring to FIG. 10, the display has a value 220 close to the measured flow rate 150 ml / h at the position 210 of the display scale where the target flow rate (same as the initial scale) 80 ml / h is indicated. Curve 200 is

Therefore, it can be approximated using this curve 200 (process of ① shown in FIG. 10).

와 목표 유량 80㎖/h를 상기 수학식 16의

에 대입하여 계수(C, 여기서는 층류총괄유량계수

)의 값을 산출하였더니 목표 유량을 얻기 위해 세팅해야 하는 계수 C_set=0.519가 나왔다. 이 과정은 상기 계수값 획득단계(S50)에서 이루어진다. 이에 따라 C_set=0.519에 대응되는 눈금, 즉, 목표 눈금을 찾을 수 있으며, 이때 찾은 목표 눈금은 45㎖/h로서 상기 수액유량 셋팅단계(S60)에 의해 출력부(120)로 출력되어 수액유량조절기에서 조작부(41)를 목표 눈금 45㎖/h에 맞추게 한다.Next, the water level difference

And a target flow rate of 80 ml / h

By substituting for (C, here laminar flow coefficient)

), The coefficient C _set = 0.519, which must be set to obtain the target flow rate. This process is performed in the count value obtaining step (S50). Accordingly, a scale corresponding to C _set = 0.519, that is, a target scale can be found. At this time, the found target scale is 45 ml / h and is outputted to the output unit 120 by the sap flow setting step (S60). At the controller, adjust the operation portion 41 to the target scale of 45 ml / h.

의 곡선(200)에서 목표 유량 80㎖/h에 해당되는 지점(230)을 찾았을 때에(도 10에 도시한 ②의 과정), 이 지점(230)에서의 표시눈금(240)이 45㎖/h로서 목표 눈금이 된다(도 10에 도시한 ③의 과정).Referring to FIG. 10 above, selected to approximate

When the point 230 corresponding to the target flow rate 80 ml / h is found in the curve 200 (the process of ② shown in FIG. 10), the display scale 240 at this point 230 is 45 ml / h. It becomes h as a target scale (process of (3) shown in FIG. 10).

을 채용하고, 계수 C에 해당되는 층류총괄유량계수

의 값을 수액유량조절기(40)의 표시눈금에 대해 획득하여 수액유량세팅을 위한 보정장치에 저장하면, 초기눈금에서 1회 실측한 유량의 값으로부터 목표 유량에 대응되는 표시눈금의 위치를 찾을 수 있으므로, 유량을 신속하게 조절할 수 있다.As such, the present invention provides the above equation

Laminar flow total flow coefficient corresponding to coefficient C

When the value of is obtained for the display scale of the infusion flow rate controller 40 and stored in the calibration device for setting the infusion flow rate, the position of the display scale corresponding to the target flow rate can be found from the value of the flow rate once measured at the initial scale. Therefore, the flow rate can be adjusted quickly.

In addition, the present invention can know the installation state of the infusion set by the actual measurement of the flow rate, it is possible to find the exact display scale reflecting the installation state without considering the installation state.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . &Lt; / RTI &gt; Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

1: sap bottle
2: Sap Set
10: drop container 20: tube 30: needle
40: fluid flow rate controller 41: operation portion 42: display scale
100: correction device for setting the fluid flow rate
110: input unit 120: output unit 130: memory unit
140: flow rate calculation unit 150: setting value calculation unit

Claims (14)

Infusion solution treatment in the infusion set 2 including an infusion flow rate controller 40 in which the indication scale is engraved within the operating range of the operation unit 41 so as to adjust the flow rate of the infusion by changing the indication scale indicated by the operation unit 41. In the correction apparatus for the fluid flow rate setting to obtain the display scale to be instructed by the operation unit 41 to administer the fluid at the target flow rate determined according to the prescription of
An input unit (110) for acquiring the target flow rate, any initial scale indicated by the operation unit, and the measured flow rate measured by the operation unit (41) indicating the initial scale;
Preset relational expression between measurable situation variable (X) varying according to the installation state of the infusion set, coefficient (C) varying according to the display scale indicated by the control unit 41, and flow rate (Q) of the fluid administered in the infusion set A memory unit 130 for storing the value of the coefficient C for each display scale obtained by substituting the measured values of the situation variable X and the flow rate Q into the display unit;
Value X ₁ of the coefficient (C) a value C ₁ and the measured after the flow rate assigned to the relational expression obtaining a value X ₁ of the status variable (X), the acquisition status variables (X) of which corresponds to the initial scale, and A setting value calculation unit 150 for substituting the target flow rate into the relational expression to obtain a value C ₂ of a coefficient C;
An output unit 120 for outputting a display scale corresponding to the value C ₂ of the coefficient C obtained by the setting value calculation unit 150;
Correction apparatus for infusion flow rate setting, characterized in that configured to include a. The method of claim 1,
The relational expression is a correction device for fluid flow setting, characterized in that the relational expression Q = CX indicating that the flow rate (Q) is proportional to the situation variable (X) and the coefficient (C), respectively. The method of claim 2,
The situation variable (X) is a correction device for fluid flow setting, characterized in that the hydraulic pressure difference between the infusion bottle (1) and the injection needle (30) determined according to the installation state of the infusion set. The method of claim 2,
The situation variable (X) is a height difference between the infusion bottle (1) and the injection needle (30) is determined according to the installation state of the infusion set for the fluid flow rate setting device. The method according to claim 3 or 4,
The input unit 110 is corrected for the fluid flow rate setting, characterized in that the initial scale equal to the target flow rate can be omitted so that the input of the initial scale. The method according to claim 3 or 4,
The input unit 110 is configured to receive a counter input drop falling from the drop container of the infusion set,
It includes a flow rate calculation unit 140 to obtain the actual flow rate by multiplying the preset volume of the drop per unit time according to the time difference of the counter input,
The preset drop volume is set by the size of the drop number per unit time,
The flow rate calculation unit 140 is a correction device for the sap flow rate setting, characterized in that to obtain the actual flow rate by multiplying the drop volume corresponding to the size of the drop number per unit time by the number of points per unit time. The method according to claim 3 or 4,
A passage for inserting the drop container of the infusion set; A light emitting element provided at one side of the passage; And a light receiving element installed at the other side of the passage and allowing light emitted from the light emitting element to pass through the dropping tube inserted into the passage; The counter is provided with a counter to detect the disturbance of light detected by the light receiving element.
It includes a flow rate calculation unit 140 for obtaining the actual flow rate by multiplying the preset drop volume by the number of drops per unit time according to the counter time difference,
The preset drop volume is set by the size of the drop number per unit time,
The flow rate calculation unit 140 is a correction device for the sap flow rate setting, characterized in that to obtain the actual flow rate by multiplying the drop volume corresponding to the size of the drop number per unit time by the number of points per unit time. The method according to claim 3 or 4,
A camera for photographing the drop container; And an image processing processor for counting the droplets by extracting the droplets from the image photographed by the camera. To counter the drip,
It includes a flow rate calculation unit 140 for obtaining the actual flow rate by multiplying the preset drop volume by the number of drops per unit time according to the counter time difference,
The preset drop volume is set by the size of the drop number per unit time,
The flow rate calculation unit 140 is a correction device for the sap flow rate setting, characterized in that to obtain the actual flow rate by multiplying the drop volume corresponding to the size of the drop number per unit time by the number of points per unit time. In the infusion set 2 including an infusion flow rate controller 40 in which a display scale is engraved within the operating range of the operation unit 41 so as to adjust the flow rate of the infusion by changing the display scale instructed by the operation unit 41. In advance, a measurable situation variable (X), which varies depending on the installation state of the set (2), a coefficient (C) that varies according to the display scale supported by the control unit 41, and a flow rate (Q) of the fluid to be administered in the infusion set. Measure the flow rate of the sap using the correction device for setting the sap flow rate, which stores the value of the coefficient (C) for each display scale obtained by substituting the measured values of the situation variable (X) and the flow rate (Q) in the set relation. In the optimum target flow rate control method using the flow coefficient of the flow controller to be adjusted,
A target flow rate input step of receiving a target flow rate determined according to a prescription for infusion therapy;
An initial scale input step of receiving an arbitrary initial scale indicated by the operation unit 41;
A measured flow rate obtaining step of obtaining a measured flow rate measured by the operation unit 41 indicating an initial scale;
Obtaining a situation variable value X ₁ of the situation variable X by substituting the value C ₁ of the coefficient C corresponding to the initial scale and the measured flow rate into the relational expression;
A coefficient value obtaining step of obtaining a value C ₂ of a coefficient C by substituting the value X ₁ of the situation variable X obtained in the situation variable value obtaining step and the target flow rate into the relational expression;
A fluid flow setting step of outputting a display scale corresponding to the value C ₂ of the coefficient C obtained in the coefficient value obtaining step, and causing the operation unit 41 to indicate the output display scale;
Optimal target flow rate control method using the flow coefficient of the flow controller, characterized in that made. The method of claim 9,
The relational expression is the optimum target flow rate control method using the flow rate coefficient of the flow controller, characterized in that the flow rate (Q) is a relational expression Q = CX which is proportional to the situation variable (X) and the coefficient (C), respectively. The method of claim 10,
The situation variable (X) is the optimum target flow rate control method using the flow coefficient of the flow regulator, characterized in that the hydraulic pressure difference between the infusion bottle (1) and the injection needle (30) determined according to the installation state of the infusion set. The method of claim 10,
The situation variable (X) is the optimal target flow rate control method using the flow coefficient of the flow regulator, characterized in that the height difference between the infusion bottle (1) and the injection needle (30) determined according to the installation state of the infusion set. 13. The method according to claim 11 or 12,
Optimal target flow rate control method using the flow rate coefficient of the flow regulator, characterized in that the initial scale is equal to the target flow rate, the initial scale input step is omitted. 13. The method according to claim 11 or 12,
The measured flow rate obtaining step
A counter input step of receiving a counter input of a drop falling from the drop container of the infusion set;
A drop speed calculating step of calculating a drop number per unit time according to a time difference of a counter input;
A measured flow rate calculating step of calculating the measured flow rate by multiplying the preset drop volume by the number of drops per unit time;
, &Lt; / RTI &gt;
The measured flow rate calculation step,
The preset drop volume is set for each drop size per unit time, and the actual flow rate is calculated by multiplying the drop volume corresponding to the drop number per unit time obtained in the drop speed calculating step by the drop number per unit time. Optimal target flow rate control method using flow rate coefficient of flow regulator.

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